Quick answers
- Is CVE-2026-104808 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-104808 being exploited in the wild.
- How severe is CVE-2026-104808?
- Informational severity, published 5 October 2026.
- Which products and versions are affected?
- Mitel MiVoice Office 400 version 11.0.96.0 (and likely earlier).
- Is there a fix for CVE-2026-104808?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-104808 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-104808?
- Check whether you run Mitel MiVoice Office 400 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A stored XSS vulnerability exists in the "Microsoft Exchange mailbox" field under Configuration → Users → Users List on the web portal (TCP 443), where user input is not properly validated or sanitized before storage and rendering. An authenticated attacker can inject persistent JavaScript or HTML that executes in the context of any user accessing the affected user properties, leading to denial of service. The vulnerability requires user authentication and admin interaction to trigger.
Affected products
- Mitel MiVoice Office 400 version 11.0.96.0 (and likely earlier)
Timeline
- 2026-10-05: disclosed
- 2026-10-05: advisory: Published by NCSC (Swiss CVA) as CVE-2026-104808, DGI-SWISS-00031